Fluid actuated tool



E. B. LEAR FLUID ACTUATED TOOL Nov. 12,- 1940.

Filed Sept. 8, 1939 4 nsuv Aeg a EAR ATTORNEY Patented Nov. l2, 1940 UNITED STATES PATENT OFFICE 2,221,100 FLUm Ac'rUA'rED Toor.

Earl B. Lear, Garfield Heights, h10, assignor'to The Cleveland Pneumatic '.l'ool Company, Cleveland, Ohio., a col'PDl'ation of Ohio Application september s, 1939, serial No. 294,002

Claims.

for controlling the amount of motive fluid admit-l table to the tool irrespective of the throttle valve normally controlling the operation of the tool. In the manufacture of airplanes or the like,

wherein aluminum .nivets are used in great quantities, it is often necessary to upset series of rivets of di'erent sizes. Heretofore, the practice followed was for an operator to upset all the rivets irrespective of the size thereof, with one riveting hammer or gun of a size and` capacity capable of upsetting the larges-t rivets. Since the use of the maximum upsetting power of the gun on smaller rivets tended to squash the rivets in a manner contrary to the standard requirements, it was necessary for the-operator, when upsetting smaller rivets, to reduce the .power of the gun by operating lthe same with a partly open throttle valve. The throttle valve of such tools being generally actuated by a finger opera-ted trigger-like lever, it was diicult for the operator to main-tain the throttle in the desired partly open position, consequently causing the upsetting power of the tool i to vary dur-ing lthe upsetting operation and -requiring the operator to exercise great precautions in order to prevent over upsetting of the rivets.

It is therefore one object of this invention to provide a riveting hammer with valve means for selectively controlling the maximum amount of motive fluid which may be admitted to the tool, while enabling its throttle valve to be moved and maintained in a fully open position.

Another object of this invention is to provide a riveting gun with a novel motive fluid inlet controlling valve forming a. compactassembly which is strong, durable and efficient.

Other objects and advantages more ancillary to the foregoing reside in the specific construction and aggroupment of the elements peculiar V to this structure, as will become apparent from a more complete examination of this specification.

In the drawing:

Fig. 1 isa side elevational view of a riveting hammer embodying the invention, the handle being partly broken away to show details of construction.

Fig. 2 is an enlarged view of the portion of the handle shown in section in Fig. 1.

Fig. 3 is a view similar to Fig. 2 showing the valve in another position.

Fig. 4 is an enlarged longitudinal sectional view taken in a plane indicated by line 4-4 in Fig. 1.

Fig. 5 is an enlarged cross sectional view taken in a plane indicated by line 5-5 in Fig. 1.

Fig. 6 is an end view looking in the direction of the arrows 6 6 in Fig. 3.

Referring to the drawing, I0 represents a riveting hammer including a cylinder II having a piston (not shown) reciprocable therein and ac- 10 tive on a rivet set I2, which is operatively mounted within a. front end of the cylinder II and secured in position by a suitable retainer I3. To the cylinder I I is threaded or otherwise aiiixed a piston-like handle I4 provided, within its upper 15 end, with a longitudinally extending bore l5y opening into an inlet passage I 6 which leads through the handle into the cylinder II for admitting motive fluid therein effecting the reciprocation of the piston. Leading obliquely from the 20 bore I5, between the ends thereof, there is another inlet passage I'I opening through the upper rear end portion of the handle and having mounted in the outer end thereof a pipe connector I8 in which may be secured the end of a motive iiuid 25 supplying conduit (not shown).

Pressed in the bore I5, lthere is a sleeve or insert I9 formed with a bore 20 extending longitudinally therethrough, and having its inner end communieating with the passage ls. Adjacent its inner 30 end, the bore 20 is provided with an internal shoulder 2| forming a valve seat for a throttle valve 22 slidably mounted within the bore 20. The valve 22 is operable away from the seat 2I by a pin or rod 23 slidable within a bushing 24 35 Amounted in the handle I4 coaxially with the bore I5. The inner end of the pin is engaging the adjacent end of the valve 22, while the outer end of the pin is engaged by a trigger-like lever 25 pivotally secured within a handle slot 26 by a 40 cross pin 2l.

Also mounted within the bore 20 of the insert I9, there is an auxiliary valve 28 having a threaded shank 29 extending through a bushing 30 screwed within the outer end of the`bore 20. 45 This auxiliary valve Ils held in the bore 20 against rotation relative thereto by a cross pin 3| carried by the bushing 30 and cooperating with a flat 32 formed on the shank 29. This fiat is long enough to enable longitudinal movement of the valve 28 50 from substantially the posi-tion shown in Fig. 2 to that shown in Fig. 3. Screwed on the shank 32, there is a small knurled wheel 33 held against longitudinal movement relative to the bushing 30 by a spring clip 34 mounted partway in corre- 55 spending grooves iprovided in the bushing' 3d and on the shank 35 of the wheel 33. Since the wheel 33 is retained against endwise movement and the valve 28 is held against rotation, it will be understood that rotation of the wheel in one or lthe other direction will eect the longitudinal movement of the valve 28 in the bore 2d of the insert is. In order to prevent accidental rotation of the wheel 33, there is clamped between .the outer end of the insert is and the head of the bushing 3i?, a washerv 3S formed with a leaf-like spring 3i extending over the wheel 33 and having its underside provided with a V-shaped protuberance 38 engaging #the knu-rls oi the wheel 33.

The insert i9 is provided with one radially extending port 39 leading from fthe passage il! into the insert bore 2U, and adjacent that port with three longitudinally spaced smaller ports-d0 leading from the bore 20 into a semicircular longitudinally extending recess Si provided on the insert i9. At its inner end, the recess 4l is terminated by an annular recess i2 having radial ports 43 leading therefrom into the bore 2S at a place adjacent to the seat 2! which ports together with the recesses i and 2, the ports 39 and 40, and the passages i6 and il constitute a motive duid conveying passageway extending through the handle lli. Constantly urging #the throttle valve 22 into engagement with its valve seat 2 I there is interposed between that throttle valve and the auxiliary valve 28 a compression spring L4.

In the operation, it will be understood that the motive uid, such ascompressed air, admitted into the inlet passage I through the connection i8 may ow therefrom into the bore 20 via the port 39, and from the bore 20 into the recesses di and 42 via the smaller ports 40. With the trigger 25 in the position shown in Fig. 1, the compression spring it active 0n the throttle valve 22 will maintain it in engagement with the valve seat 2i for preventing the ow of the motive iluid past the valve seat 2i, thereby preventing supply of the uid to the hammer. Upon exerting pressure on the trigger 25,the operator will cause its pivotal movement in a counterclockwise direction around the pin 21, and the consequential longitudinal movement of the pin 23 toward the throttle valve 22, thereby compressing the spring 44 for opening the valve relative to its valve seat as clearly shown in Fig. 3. In this instance, the motive uid admitted into the inner end portion of the bore 28 through the ports 43, is free to now through the passage I6 into the hammer for eiecting the reciprocaton of its piston and the consequential delivery ol.' impacts on the rivet set i2 for upsetting the rivet engaged thereby.

When the auxiliary valve 28 is positioned as shown in Fig. 2, that is, at the end of its inward movement, the ports 39 and Il! are almost 'entirely closed by the valve. In this instance, the

amount of motive uid thus admitted to the cylinder il via the recess 42, the ports I3 and the passage i6, is calculated to produce reclprocation of the piston at a relatively slow rate of speed and power, a condition of operation found desirable when upsetting very small rivets made of soft material such as aluminum. When it is desired to upset larger rivets and therefore operate the tool at a greater rate of speed and power, the operator may simply rotate the wheel 33 in a direction causing outward movement of the auxiliary valve 28, thereby resulting in one or more of the ports ll to be uncovered by the valve for enabling a greater amount of motive fluid to be admitted to the piston for effecting its reciprocation at a greater rate of speed and power.

From the foregoing description, it will be understood that by rotating the wheel 33, it is possible to move the auxiliary valve 28 into more or less complete open position relative to the passageway extending through the handle ill or more particularly relative to the ports 39 and lill forming a part of that passageway, thereby controlling the motive fluid conveying capacity of the inlet passageway while enabling the operator to maintain the trigger 25 in a fully depressed position resulting in the full open position of the throttle valve 22.

Although the lforegoing description ls necessarily of a detailed character, in order to completely set `forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modications of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. In a handle for fluid actuated tools, a motive fluid conveying passageway, a sleeve in said handle intersecting said passageway, ports through said sleeve enabling conveyance of the motive uid through said passageway, passageway controlling means including a throttle valve slidable in said sleeve into opened or closed positions relative to said passageway, and an auxiliary slidable valve in said sleeve selectively movable into more or less opened position relative to said ports for controlling the motive iuid conveying capacity of said passageway when said throttle valve is fully opened relative to said passageway.

2. In a handle for iiuid actuated tool, an insert, a motive uid conveying passageway in. said handle extending through said insert, means for opening or closing said passageway including a throttle valve slidable in said insert, means independently of said throttle valve for selectively the desired position.

3. In a handle for fluid actuated tool, an insert, a motive fluid conveying passageway in said handle extending through said insert, meansfor opening or closing said passageway including a throttle valve slidable in said insert, a triggerlike lever pivotally carried by saidhandle operatively assoclated with said throttle valve for opening the same, means independently of said throttle valve for selectively controlling the amountl of motive iiuid capable of flowing through said passageway when opened by said throttle valve including an auxiliary valve in said insert disposed coaxially with said throttle valve for movement into more or less open position relative to said passageway, and rotatable means operatively associated with said auxiliary valve operable from the exterior of said handle for eiecting movement of said last named valve.

4. In a handle for fluid actuated tools, an insert having a bore extending therethrough, a pair of coaxail valves slidable in said bore, means for eifecting slidable movement of one of said valves including a. pivotally movable trigger-like lever carried by said handle, a rotatable member exteriorly of said handle operatively associated with the other of said valves i'or effecting its slidable movement, and ports through said insert controlled by said valves.

5. In a handle for iluid actuated tools, an inlet connection projecting outwardly from said handie, an insert in said handle, an inlet passageway leading from said connection through said insert, a duality of coaxially slidable valves in said insert for controlling said passageway,

means for eectlng slidable movement of one of said valves including a pivotally movable triggerlike lever carried by said handle, means for eiecting slidable movement of the other of said valves including a rotatable member exteriorly of said handle below said connection, and a lock. associated with said member for preventing its 'accidental rotation. v

EARL B. LEAR. 

